Dental tool-holder.



um- 49,234. Patented May a, 1900.

' A CHIAVARO. DENTAL TOOL HOLDER.

(Application filed Aug. 26, 1897.)

( No Model.)

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Inventor.

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Altulllutv ilmrsn dramas Parana rarest AYGELO OHIAVARO, OF eA'rANiA,sioiLY.

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steers-resales forming part of Letters patent is. 649,234, dated ma s,leo'o.

To (ZZZ whom it may concern:

Be it known that I, ANGELO OHIAvARo, a subject of the King of Italy, anda resident of Catania, Sicily, (residing temporarily in the city andcounty of Philadelphia, in the State of Pennsylvania,) have inventedcertain new and useful Improvements in Devices for Holding Dental andother Tools, of which the following is a full, 'clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

This invention relates to a device of simple, and efficient constructionfor holding dental and other tools whereby the tool may be adjusted todifferent Working angles or posi: tions in respect to the handle to meetvarious requirements of service, thereby-attaining by a single implementthe several functions heretofore performed necessarily by a large numberof separate and independent instruments.

To this end the invention, as generally stated, comprises a handleprovided with a socketed end portion having in and around its wall aseries of recesses of Varying depths, a tool-bearing ball provided witha neck and fitted in said socket so as to have a universal movementtherein, whereby said ball may be adjusted to dispose the neck in anyone of said recesses,and means for clamping said ball in diiferentpositions of adjustment.

The invention also comprises various novel features of construction,which will be herein-- after pointed out.

In the annexed drawings, Figure l is a side elevation of a deviceembodying, my invention. Fig. 2 is a longitudinal vertical sectionthereof. Fig. 3 is a similar section, enlarged, of the forward orworking end of the device. Fig. 4 is an end and side view, respectively,of the socket-piece. Fig. 5 is a side eleva tion of the tool holdingball.

A represents a handle of any appropriate form and size for its intendedpurpose. This handle is formed with a central perforation a. whichextends from end to end thereof and which is screw-threaded at or nearone of its ends, as at ct. The adjacent end of the handle is exteriorlythreaded, as at :1), and slightly ooncaved, as at a". Screwed onto thepart a? is a socket-pieccii, the outer end of which is Application filedAugust26,1897. serials 649,551. mammal.)

be turned to and seated in an yof the recesses,

as desired, and thereby supported on its un der and lateral portions atdiiferent working angles in respect to the handle. This neck has aninternally-threaded extension 0, into which may be screwed thecorrespondingly threaded shank of an appropriate tool, as D. Extendingthrough the central perforation of the handle is a rod E,- one end ofwhich is screw-threaded, as at e, to. engage the threaded portion of theperforation, while the op'- posite extremity is provided with a' knob orcap e, which closes the end of the handle. Thus if the ball be turned toseat the neck thereof in one of the recesses of the socketpiece and therod be then screwed up the inner end of the latter will bear forciblyagainst the ball and clamp it in place, thereby maintaining the toolfixedly in the angle or position determined by the depth of the recess.The opposing Wall of the recess acts as a back and lateral support forthe neck of the ball to counteract the thrust of the tool While it is inposition.

I preferably recess the edge of the socketpiece at points intermediatethe recesses b, as at b, so that the neck may be supported therein, ifdesired. I also preferably provide the ball with suitably-locatedsockets c and point the inner end of the rod E, so that the point mayregister with one of the sockets c when the ball is adjusted, andthereby aid still more effectually in clampingthe tool in position.

I may add that I do not limit myself to the particular constructionabove described, as obviously the device may be variously modifiedwithout departing from the fair spirit of the invention.

l. The combination,with a handle or holder provided with a socket havingin and around its wall a series of recesses of varying depths, of atool-bearing ball provided with a neck and fitted in said socket,-soasto have a universal movement therein, whereby said ball may beadjusted to dispose the neck in any one of said recesses, and means forclamping said ball in positions of adjustment, substan tially asdescribed.

2. The combination, with a longitudinallypcrforated handle or holder, ofa screw-threaded socket-piece on one end thereof having in its outer enda series of recesses of varying depths, a tool-bearing ball fittedbetween said socket-piece and the end of the handle so as to have a,universal movement therein and provided with a neck adapted by the adjustment of the ball to register with the recess or recesses in the endof the socket piece, and

a screw-rod fitted in said handle and adapted to clamp the bell,substantially as described.

The combinatiomwith a longitudinallyperforated handle or holder, of asocket-piece on one end thereof, a tool-bearing ball fitted in saidsocket-piece so as to have a universal movement therein and providedwith a series of indentations or sockets, and a screw-rod fitted in saidhandle or holder and pointed at its inner end for engagement with saidindentations or sockets in the ball, substantially as described. 1

In testimony whereof l have hereunto affixed my signature in thepresence of two subscribing witnesses.

ANGELO GI-IIAVARO.

Witnesses:

JOHN W. lilonnnnr, Jonn R. NOLAN.

